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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccf802a81e72509db0e23e5a973327efcaadd800ac7836de7e36aeea62ba06b' 
  AND token = 'hLqYMCpIkTXjg+NbOetIguEDLOsaLEW++nP1o5f+cow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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