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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dde84b2ddd6c4311b92857b2e24d186f1df4e77a98d6a674dc550940dad4790' 
  AND token = 'cwkwB/bAJ8vIhLvCaIX4p4iAqYMvjATJFayHNDm19sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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