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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e0ef208aedd9c7b1fa59c63f1d085b6018683ce3ce53ceb4d59c09a6a075c1' 
  AND token = '//8a7wc+ArG46nZOvwjZl15Vp4T0ocyKRK+LR+PmRPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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