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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8df7f3e815dc39026eca93c0faae0d7f1f070db6da3fccfadb272bd4879718b' 
  AND token = 'zVv/16kmb3JpnQnNqUo96Rd2Wn8THyVSPn9xHwPKDbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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