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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b758016a1c5635ad2ecdc7f0cbab85798906e8463c060ef82cef40ca08201a9b' 
  AND token = '7gLecUu4x8Do3uj0GeQn8Tzu40e47PzeT8H+ZcbchzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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