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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c371622e9a32374f6aab1f538549cf4f51397915443cad9faa19adc6c8f524ed' 
  AND token = '0e5oEZDsfRQeuOCNO+F4PvdTp13nz4fDu6p0QXnx8Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}