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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6520dd2a47f906ec9d579b0fd7f08b184fc70fab4d0e7317e165503d4bfd0348' 
  AND token = 'lSJHWYngGbpYpCvjWgGu6ooea0li4uY1OTg8LoXDh7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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