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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2c513ad5b7542fce136710bef714b20075559e1eb0e724cd616dc85eef7690' 
  AND token = '4NIBV39jvsg43PfVGPMd5rVXfhgu17pq2N2bkdGm/JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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