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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd1a16a8c51253614e4f6a8078e4bf24ea5a26b5fcf3d3372ce99d13b9d4ed6' 
  AND token = 'TtqNx6iLu6b/ymYtx+rTnkqFV3Jx3VpqWmvzagOx/Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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