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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80c8ba4d5e7bf20b7c8e200a594eeaabe8c0ee99d3408f291355b13c857a5b2' 
  AND token = 'SLquZMOsLjuL2IsFHiG7M7x/pwlp1gsfkWeS8cDVK6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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