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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492b2113d5874fd5f07c76f71dcab68da604c0d39ab7be4471a5a653ecfccfc8' 
  AND token = 'iHOvb95UM0nLx1D9ouA1gPk8Np05UOAsy+1ixumuq50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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