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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edabb1b69d8aa39a2e8bc246d4da458456a1f6985b43865fcf677d1acea87d91' 
  AND token = 'A5mDO9k3MHPEllFda4iy3yLt+aZz4YoUXKhQDlitFl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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