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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0281c2c2d53e1d23ac713f7dcaf7a3470c14f0c0dbb5226fe23502e1a32b752b' 
  AND token = '8yO9GoVEQyDZFpASIrAzhLDZu4mPjoZ6viJIg/CUQk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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