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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5319da14014ffee26e4f3db38fb6c5901b8a66ff852592b199bf364b7292cdaa' 
  AND token = '7/YolLnUOObPAgu9OsX6Ig3/NsXuDswKD4SDysr+B0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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