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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64f56bf62a6b06f192d8603d5856cfae7c32e7a29f66ab80254330ca0b1c05c' 
  AND token = 'iEFZuh31AEnFnfOUYGRE02JLFs4I6nu6Pvt+wTvlLrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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