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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e48fc2a85de3df1541e20304aaf94cb11f54ef5d1e613830dfcb6bf400272b' 
  AND token = '0K1+EHilMjLn82uFN1gQBynVvQjhCSbHh2aJ+6o6HLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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