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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167c269a7783c546ab39e42b190f2c8eab84ae2ac313b293e8e0c7dc417f2b4d' 
  AND token = '5mVRsHOfjztcWQY6eiszIC7/KaICVVvYjWr+3caV+ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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