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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d8619d44f3b7a7e70be5f7fd0cf594030c87f9ca21c463932db6a7d0bd9490' 
  AND token = 'Nk5fFDSKJg/qU+utOFyosb6nono1Dq8M0YYHJ1UbyBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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