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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9388a3e20757f077e29520ced9794546b6ab51b15b0ea76e67b6441e70dac454' 
  AND token = 'Cbn9PISKOjFUt6fkeIQQ8CEZLpH8OWgnrf95i/6udVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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