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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635135d068e4ac6b4d61e50a677d2432c3b0b5879aeadb27031db5383b8f605e' 
  AND token = 'gClCE7TC/qQvFZUK/mvzCkcQjdDxQGDj7pWQ03KZMng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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