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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aac53c50163bbe80dd04d108f3139ce33931c5cc41704fb88ce736ae93f9d51' 
  AND token = 'J0FN0P6N8mFxpU0GenBYu0Equ7+c6Ydy6FAS0U/G63c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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