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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fc06f24d91aef3622a850d3a2c9e1bca4e84cd1c1694160b6d3d68923462d9' 
  AND token = '9t4AVCfUy+yW10ORGRtRaCQH3a6s4Tf2I4O+5dbW2aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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