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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ae26d8f5aee6e6be152dba20ef39fe63877c4d78434429bde94e027a51a40d' 
  AND token = 'wk5wr5nn5/BTz5X0MIj8rAEAzr73bH2m6VGq7GY/D7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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