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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9801d3f33984635fb4e5e13a9c6a067fa5aa98ac0ff5e53c8fd490a4868606fc' 
  AND token = 'BjqR5cXXmbo5bxCCnjycPv1n++ZWh9f5TSlfYHW81QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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