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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c6fd9dd8b83ebd2a91f69c5fb66a3c68ab544101b8ce8224f21580060230cf' 
  AND token = 'l48evyNE+hSPsA/c22jqiXK06SxL+/HUAU9rekULJrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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