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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bb2a2df095188e7c38548515083b13b9298a2543139e0620f472e8659c3dc5' 
  AND token = 'i4RDl8+jTtNJVGXBsgAC1/8Tze4g7yEwE82Og42aEC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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