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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417c34ff00a92f3287a66e1796fae84d6501b33cc668e7b97006dfd8f1bfff4d' 
  AND token = 'ap2qNhax0tm8xUmKe7r6aj1goSlBXwbHxC98f7sZ4y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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