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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a997cfc1da8ce49d643f502187041b999b8cfb7af838186900928ed250e5e653' 
  AND token = 'ks+Ze3EJvX6UrcG5s3xFsmvucq3/EyHKaFgV1PPl8L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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