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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c09a95a8efc9d4c3931ac66c2d3c07e1c7ab25bd62fbcb25037b4ec7af6051e' 
  AND token = '6W2Xa3TJ4CbRr2aAWDPajZub4DpxuUwyy3xU4kaEj0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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