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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444ec9440e57723c8905f4caa67988e5073a79ba29ad79e6b501c4f0f2bb6d06' 
  AND token = '+d80VIXdGZv6Dlc+feJyXZajE93gNOV/XvGUh3f5OH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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