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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8660d73b721b10cf71b9b98eeb6b51606529cc2aa50fe4a7acede0f2c423adb5' 
  AND token = '//KtBL3eo7Ea+LrHmZ7xM0PIovsktDUSm/x1r2cOixg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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