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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55409aebc5f2fcaf1500a10a0b63d9b859312647dc33e154e9bfb8e75a4a0cc7' 
  AND token = 'dPPXLsqQFlPGAVoQzXggQP996HNc2hdmq2nohEFKvhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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