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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4d3110fcc62385252903103afd967919babcf0cd079bd7e89d0486e7770a27' 
  AND token = 'AYbAmucSM+D04qG+UcUoByf5Gt2gg8S7PDC2Nvx3lk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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