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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b91e017f3da5342a5e1c407016474070a8eb472333cb2a154e49c38a6da58c' 
  AND token = 'pFMlOoTk1f0wGri/30W/Wc1koVfnGk2SCzsR4sdFSYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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