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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b59a1c11554b4693b2552d1fcbbe2c86c373e5f3fdc6e2bb718c124a50f7d9' 
  AND token = 'j0u/+PF4ARmGJy25FA5P3bwR3lUra2G4veAQN8S3jYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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