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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55937c1420e510342b83c2fa82fa062a36fcad3d26c947dc24e3fb68a0965a5' 
  AND token = 'acOmHOegmh5b9oSrDqAo22orFThmDVXa/PxeQW1V+io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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