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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fd6cc85088f38914b6988a22e0c52914b2e448bde01b2ebf9625f95470bdbc' 
  AND token = 'SW4dHrXEy2iMJv67aHUSgMmQr5A3MheYLSpFbVA/hJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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