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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44aa41df61a5134a9659c77d1c7db8f52765ff322627d50defc29cb75a3699d' 
  AND token = 'hKGhG97/NHZTHv08PsK0zayyNG2e8TG0Mx1eCWVmSjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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