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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e5918432c8c63072aedd4d2124335e8419b14c23a70e61e38a8889bf7bf99b' 
  AND token = '0+hN4HAMaMIbufDAdybvezk75wu9dtls/leclgHWPKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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