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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d0f29354241a2566ac54988f9716eccf3eaeeea60c2af361228ec1cf061e12' 
  AND token = 'Zjj0UaqGtu3ttc/AzDLD8Iuie/IIC5FfwdPL2fz2dgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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