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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba888cad2e8b64775c9b2a9be45e178a86d0dd2d422387bb7a23110df055a58' 
  AND token = '7Rznv+CQop78OczOi/mz2De9Rx4labUxAYlWnvB/jG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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