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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7151310c99a731d326fc27db87caa06fb8bfa4fdbbd4f9c7ad1c438d2977a2' 
  AND token = 'b3gz9rLcZKg88YGoeDGj27GtTtE2wh8+4XrHgKM2j7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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