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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197728beb9647bce238f5a3033bd653c5f1afd66f4b8e92eb6cca188d0bbc607' 
  AND token = 'WVIO70I6BFrebAkaltP0cnZ4a0cAiGXcUgJV5m7GhyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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