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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c2eb515da69e7b395cc1c869dea091894a2167b7e281e40dba0aae61120411' 
  AND token = 'A5xbHz2gAGGi78yGLjcs6RKcQukVWO0TVR30JoTJcmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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