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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ffe6a7cbc79a9e76693c5c195a0f6439783f25b74fc4e1debca5a5f36d6d87' 
  AND token = 'LQ/VOVkLEwsFeP8VUlbgdb4Rm9+/MlSS6NPJcZlSVHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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