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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e88ee805cba825813f2092f1b3122aa47fd01a4a2b991b2be2fb405e88e328' 
  AND token = '5wI7NeSlDkqknoE1sedqnPf4u/d42KVqUV/Y3bF3qIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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