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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5be6c6eb75d3fd458480b32f076dd4bb5a26c02193262e7f018af216aa1bdb' 
  AND token = '6Q3ScW8JUDU0X3Hv9me93qFePmvV8QxVdtWXsMSoOkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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