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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2671884ae784cb731812a7242d34a9c53c412f9eb8c7cc34dd7ec0dfec14e267' 
  AND token = 'AVMv8K6pJMPs+biP/7x+a7ty/rLZcfSZI769zY5KpTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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