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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2887fb8716be14323003580d98d227585710e5a849d00dd57a4c2e619b5026' 
  AND token = 'TDLSiL/yNO9mMsSd1551mCA9EPX9K0LleQbYsXIE4Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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