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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd919b65f9515fb7ac9de8fcb299e03b135f956eb6e2fdcd23326defb09cd5bbb' 
  AND token = 'LtCmmIoY+JIFLomAm3W+3qisqMKmQjp1u72JtOhcLw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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