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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf3b8d395ba2d0561ef645e8db17a19e3cc1f69ef540ab06d4ebc9ac2075cd6' 
  AND token = '1aK+wr8wPfAOylMmRZGfePcmAGZlZ4NWOR4YMVAu6xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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