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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5151364b8f584b7ba71771b0c61407708849e7f6fd2fcae03e48f6f98d9f6f' 
  AND token = 'oLcs/aNHk/byVrX3yjMog3qvFLSpL2vWRSs0H2GOhWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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