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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30884f2d4fcb659ac5660520442974ec5922ed2e8cd9c01b691830b4095619a3' 
  AND token = '/QclpECEWyQQp35KCYNOxoIIjNzG5kACveNzilUoKBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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