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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9c904665a44a67691d7db52477039487fbc3e9461af8c3d4a7868c3ee6b0fa' 
  AND token = '8gieNH/uWNlEQ74MqhppL9pAupy53KRaCHrSl01NaBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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