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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea49b68c72952cd1bac82b79b4d4dc9b793a9e708fa355599dbc3c11e82d884' 
  AND token = 'H4tbgZIzKJh4c2Qy/VLMzgcgwgpvh/0q+939ASS11A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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