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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33cdd4f8e18bb67ac50064b2e01e6cb59d0ac0ce5c537d9b553a7aeba7409e77' 
  AND token = '97zgnK8eRL9nsXz2gdlV9EFxsxCLiop8qwiYZCoMcvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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