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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe04b4e1ac5ffc1134e398e7989c8b8ae9372759e5aec9166be029c4103ca1d4' 
  AND token = '2cP3Ea72r1plGxIW70fc3iC+TWHgImvNK5uZOVc/NeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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