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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bfca9388f7c9d4a24a737edb85a1fa3274386e7daabcad84521a8c8c9e8720' 
  AND token = 'MhuFbyuLC9GsJGzz19RwEM6006xfyONMSU2U0MYv52Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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