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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7514da85ffe6a081beef7725d1c05407ce84b9b617d4b9e7baae7ae830eaa64b' 
  AND token = 'ODZ+gJQhvX/r4ADFKIOiadwjFvtLDSbDJvMRVZw3cEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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